HW2 solution - Homework 2 Solution 1. What is a...

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Homework 2 Solution 1. What is a stoichiometric intermetallic compound, and how would it appear in a temperature-composition phase diagram? How would a nonstoichiometric intermetallic compound appear? (2’) When a compound cannot tolerate any deviation from its fixed atomic ratio, the product is known as a stoichiometric intermetallic compound and it appears as a single vertical line in the temperature-composition phase diagram. If some degree of chemical deviation is tolerable, the vertical line expands into a single-phase region, and the compound is known as a nonstoichiometic intermetallic compound. 2. Describe the relative ability of iron to dissolve carbon in solution when in the form of austenite ( the elevated temperature phase) and when in the form of ferrite at room temperature (2’) At an elevated temperature, pure iron assumes a face centered cubic structure known as austenite. The key features of austenite include high solubility of carbon, at most 2.11% of carbon can be dissolved in austenite. At room temperature, there is almost no carbon in ferrite, as the temperature increase to eutectic temperature, ferrite can hold about 0.02% carbon in a solid solution. 3.
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This note was uploaded on 01/19/2012 for the course IE 230 taught by Professor Xangi during the Spring '08 term at Purdue University-West Lafayette.

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HW2 solution - Homework 2 Solution 1. What is a...

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